Startseite Dolomite dissociation indicates ultra-deep (>150 km) subduction of a garnet-bearing dunite block (the Sulu UHP terrane)
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Dolomite dissociation indicates ultra-deep (>150 km) subduction of a garnet-bearing dunite block (the Sulu UHP terrane)

  • Bin Su , Yi Chen EMAIL logo , Shun Guo und Jing-Bo Liu
Veröffentlicht/Copyright: 30. Oktober 2017
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 102 Heft 11

Abstract

The dissociation of dolomite into magnesite and aragonite has been regarded as a useful indicator for ultrahigh-pressure (UHP) metamorphism. In this study we investigate an unusual texture involving magnesite and calcite intergrowths with dolomite relicts in a garnet-bearing dunite block from the Sulu UHP terrane, eastern China. The carbonate intergrowths typically occur as interstitial grains with low dihedral angles against surrounding olivines and have a dolomitic precursor composition. Our observations indicate that the carbonate intergrowths were initially inherited from the well-documented magnesite and aragonite assemblage after dolomite dissociation. The initial dolomite grains were likely to crystallize during the dolomitic melt metasomatism within the shallow lithospheric mantle. A series of experimental studies have well determined the equilibrium boundary of dolomite = magnesite + aragonite greater than 5 GPa along a wide temperature range, which provides direct evidence that the dunite block was subducted to depths greater than 150 km during the Triassic continental subduction. The preservation of magnesite and aragonite (now calcite) intergrowths without dolomite synthesis reaction during exhumation is probably due to the lack of fluid and rapid decompression from the peak stage to the calcite stability field. In this study, we suggest that dunite blocks from high-pressure and UHP terranes could have subducted to UHP conditions similar to garnet lherzolite and pyroxenite and were then entrained into slab slices rapidly en route to the surface.

Keywords: Dunite; dolomite dissociation; ultra-deep subduction; Sulu belt

Acknowledgments

We thank Saihong Yang for help with the SEM analyses, Di Zhang and Qian Mao for help with the EPMA analyses, Yijie Gao for help with the Raman analyses, and Lixin Gu and Xu Tang for help with the TEM analyses. B.S. is grateful to Xiaochun Li (The University of Hong Kong) for his helpful discussion. Critical reviews by Jörg Hermann and an anonymous reviewer helped to improve the manuscript. We also thank Jennifer Kung for handling this manuscript. This work was funded by the National Basic Research Program of China (973 Program 2015CB856103), the National Science Foundation of China (Nos. 41372078, 41372080) and the National Postdoctoral Program for Innovative Talents (BX201700239).

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Received: 2016-10-8
Accepted: 2017-7-21
Published Online: 2017-10-30
Published in Print: 2017-11-27

© 2017 Walter de Gruyter GmbH, Berlin/Boston

Artikel in diesem Heft

  1. Highlights and Breakthroughs
  2. Rutile: A novel recorder of high-fo2 fluids in subduction zones
  3. Highlights and Breakthroughs
  4. Granites and rhyolites: Messages from Hong Kong, courtesy of zircon
  5. Review
  6. Do Fe-Ti-oxide magmas exist? Probably not!
  7. Special Collection: Biomaterials—Mineralogy Meets Medicine
  8. Calcium (Ti,Zr) hexaorthophosphate bioceramics for electrically stimulated biomedical implant devices: A position paper
  9. Special Collection: Water in Nominally Hydrous and Anhydrous Minerals
  10. Raman spectroscopy of water-rich stishovite and dense high-pressure silica up to 55 GPa
  12. Tracking the evolution of Late Mesozoic arc-related magmatic systems in Hong Kong using in-situ U-Pb dating and trace element analyses in zircon
  14. Defect contributions to the heat capacities and stabilities of some chain, ring, and sheet silicates, with implications for mantle minerals
  16. Phase transition in SiC from zinc-blende to rock-salt structure and implications for carbon-rich extrasolar planets
  18. Non-destructive, multi-method, internal analysis of multiple inclusions in a single diamond: First occurrence of mackinawite (Fe,Ni)1+xS
  20. The fate of ammonium in phengite at high temperature
  22. Parameterized lattice strain models for REE partitioning between amphibole and silicate melt
  24. Unusual replacement of Fe-Ti oxides by rutile during retrogression in amphibolite-hosted veins (Dabie UHP terrane): A mineralogical record of fluid-induced oxidation processes in exhumed UHP slabs
  26. Crystallization experiments in rhyolitic systems: The effect of temperature cycling and starting material on crystal size distribution
  28. Dolomite dissociation indicates ultra-deep (>150 km) subduction of a garnet-bearing dunite block (the Sulu UHP terrane)
  30. Microscopic strain in a grossular-pyrope solution anti-correlates with excess volume through local Mg-Ca cation arrangement, more strongly at high Ca/Mg ratio
  32. Ferruginous seawater facilitates the transformation of glauconite to chamosite: An example from the Mesoproterozoic Xiamaling Formation of North China
  34. Charleshatchettite, CaNb4O10(OH)2·8H2O, a new mineral from Mont Saint-Hilaire, Québec, Canada: Description, crystal-structure determination, and origin
  36. New Mineral Names
  38. Erratum
  39. Book Review
  40. Non-Traditional Stable Isotopes
https://doi.org/10.2138/am-2017-5982
Schlagwörter für diesen Artikel
Dunite; dolomite dissociation; ultra-deep subduction; Sulu belt

Artikel in diesem Heft

  1. Highlights and Breakthroughs
  2. Rutile: A novel recorder of high-fo2 fluids in subduction zones
  3. Highlights and Breakthroughs
  4. Granites and rhyolites: Messages from Hong Kong, courtesy of zircon
  5. Review
  6. Do Fe-Ti-oxide magmas exist? Probably not!
  7. Special Collection: Biomaterials—Mineralogy Meets Medicine
  8. Calcium (Ti,Zr) hexaorthophosphate bioceramics for electrically stimulated biomedical implant devices: A position paper
  9. Special Collection: Water in Nominally Hydrous and Anhydrous Minerals
  10. Raman spectroscopy of water-rich stishovite and dense high-pressure silica up to 55 GPa
  12. Tracking the evolution of Late Mesozoic arc-related magmatic systems in Hong Kong using in-situ U-Pb dating and trace element analyses in zircon
  14. Defect contributions to the heat capacities and stabilities of some chain, ring, and sheet silicates, with implications for mantle minerals
  16. Phase transition in SiC from zinc-blende to rock-salt structure and implications for carbon-rich extrasolar planets
  18. Non-destructive, multi-method, internal analysis of multiple inclusions in a single diamond: First occurrence of mackinawite (Fe,Ni)1+xS
  20. The fate of ammonium in phengite at high temperature
  22. Parameterized lattice strain models for REE partitioning between amphibole and silicate melt
  24. Unusual replacement of Fe-Ti oxides by rutile during retrogression in amphibolite-hosted veins (Dabie UHP terrane): A mineralogical record of fluid-induced oxidation processes in exhumed UHP slabs
  26. Crystallization experiments in rhyolitic systems: The effect of temperature cycling and starting material on crystal size distribution
  28. Dolomite dissociation indicates ultra-deep (>150 km) subduction of a garnet-bearing dunite block (the Sulu UHP terrane)
  30. Microscopic strain in a grossular-pyrope solution anti-correlates with excess volume through local Mg-Ca cation arrangement, more strongly at high Ca/Mg ratio
  32. Ferruginous seawater facilitates the transformation of glauconite to chamosite: An example from the Mesoproterozoic Xiamaling Formation of North China
  34. Charleshatchettite, CaNb4O10(OH)2·8H2O, a new mineral from Mont Saint-Hilaire, Québec, Canada: Description, crystal-structure determination, and origin
  36. New Mineral Names
  38. Erratum
  39. Book Review
  40. Non-Traditional Stable Isotopes
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